Hello there,
I’ve been wondering how/why the mail clients shows logos next to the sender address.
I’m aware of the existence of BIMI, all domains that have a BIMI entry are shown with the corresponding logo.
But I have a couple of domains that do not publish BIMI entries but nevertheless a logo is shown.
One example is letsencrypt.org
These are favicons. I assume it’s just grabbing them from the websites of the respective domain names from which the messages were sent, e.g. https://letsencrypt.org/favicon.ico.
You can disable this under Mail Preferences → General → Gravatar Preferences → Use gravatar and favicon avatars.
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